To remove wine stains from a carpet, you can use a combination of baking soda, club soda, or dish soap and white vinegar. Here's a step-by-step process:

1. Blot the stain with a clean, dry cloth to absorb any excess liquid.

2. Pour a bit of cold water onto the red wine stain to saturate it.

3. If you have club soda, pour a small amount onto the stain, blot again, and leave it overnight. Repeat the process until the stain is gone.

4. Alternatively, mix a tablespoon of dishwashing soap and a tablespoon of white vinegar with two cups of water. Apply the solution to the stain and blot with a rag, cloth, or paper towel.

5. If the stain remains, make a paste using a 3:1 ratio of baking soda to water. Apply the paste directly to the stain, let it dry completely, and then vacuum up the dried paste.

Remember to use cold water, as warm water can set the stain and make it harder to remove.